HD is great and I think it is good that more and more channels to jump on. Now for the negatives. The clarity is an extremely left. Much is not a true HD and only upscaled. Especially in comparison to ARD HD and ZDF HD, the private stink from pretty. Poor to partly granular quality is the result. Compared: How I Meet Your Mother on ORF1 HD to HD ProSieben. The image on ORF1 HD is much brighter and sharper. For 50 do you expect even more.
Conclusion: In principle a good idea, the implementation rather poor.